Automotive road milling machine

Abstract

In an automotive road milling machine ( 1 ) for milling ground surfaces ( 3 ), with a machine frame ( 2 ), a milling drum ( 4 ) with a quick-change system arranged at the machine frame ( 2 ) in a drum housing ( 11 ), a driving device ( 6 ) for driving the milling drum ( 4 ), a reduction gear ( 8 ) arranged between the driving device ( 6 ) and the milling drum ( 4 ), where the milling drum ( 4 ) is arranged between drum housing walls ( 12,13 ) of the drum housing ( 11 ) running orthogonally to the axis of rotation of the milling drum ( 4 ), where the quick-change system is provided with a basic drum body ( 14 ) and at least one milling tube element ( 10 ) capable of being pushed onto the basic drum body ( 14 ), where the drum housing wall ( 13 ) opposite the drive-side drum housing wall ( 12 ) is easily removable for the quick exchange of alternatively usable milling tube elements ( 10 ), it is provided for the following features to be achieved: the housing ( 9 ) of the reduction gear ( 8 ) is attached to the machine frame ( 2 ) in a torsionally rigid fashion, inside the machine frame ( 2 ), between the driving device ( 6 ) and the drum housing wall ( 12 ) at the drum housing ( 11 ).

The invention claimed is: 
     
       1. An automotive road milling machine for milling ground surfaces, comprising:
 a machine frame; 
 a drum housing attached to the machine frame, the drum housing including a drive-side drum housing wall and a removable drum housing wall opposite from the drive-side drum housing wall; 
 a milling drum arranged between the drive-side drum housing wall and the removable drum housing wall, the milling drum having an axis of rotation, the drive-side drum housing wall and the removable drum housing wall extending orthogonally to the axis of rotation, the milling drum including a quick change system including a basic drum body and at least one milling tube element capable of being pushed onto the basic drum body, the removable drum housing wall being removable for the exchange of alternatively usable milling tube elements; 
 a milling drum drive for driving the milling drum; and 
 a planetary reduction gear between the milling drum drive and the milling drum, the planetary reduction gear including a planetary reduction gear housing torsionally rigidly attached to the machine frame between the milling drum drive and the drive-side drum housing wall. 
 
     
     
       2. The automotive road milling machine of  claim 1 , wherein:
 the planetary reduction gear housing is torsionally rigidly attached to the machine frame outside the drum housing. 
 
     
     
       3. The automotive road milling machine of  claim 1 , wherein:
 the planetary reduction gear includes an output element facing the drum-side housing wall; and 
 the basic drum body includes a free end mounted on the output element so that the output element drives the basic drum body. 
 
     
     
       4. The automotive road milling machine of  claim 3 , wherein:
 the basic drum body extends through the drive-side drum housing wall; 
 the free end of the basic drum body is torsionally rigidly connected to the output element; and 
 the machine further comprises a labyrinth seal between the basic drum body and the drive-side drum housing wall. 
 
     
     
       5. The automotive road milling machine of  claim 1 , further comprising:
 a floating bearing mounted on the removable drum housing wall; and 
 the basic drum body including first and second ends, the first end being mounted on the planetary reduction gear, the planetary reduction gear providing a fixed bearing for the first end of the basic drum body, and the second end of the basic drum body being detachably connected to the removable drum housing wall via the floating bearing. 
 
     
     
       6. The automotive road milling machine of  claim 1 , further comprising:
 conveying blades attached to the basic drum body between the milling tube element and the drive-side drum housing wall. 
 
     
     
       7. The automotive road milling machine of  claim 1 , wherein:
 the drive-side drum housing wall includes a lower edge projecting downward further than the planetary reduction gear housing. 
 
     
     
       8. The automotive road milling machine of  claim 1 , wherein:
 the at least one milling tube element is of integral design. 
 
     
     
       9. The automotive road milling machine of  claim 1 , wherein:
 the drum housing includes a longitudinal wall extending parallel to the axis of rotation of the milling drum, and the longitudinal wall has a discharge opening defined therein. 
 
     
     
       10. The automotive road milling machine of  claim 1 , further comprising:
 a plurality of wear elements arranged below the planetary reduction gear housing and parallel to a ground surface, the wear elements being attached to the machine frame. 
 
     
     
       11. The automotive road milling machine of  claim 1 , wherein:
 the planetary reduction gear housing has a planetary reduction gear housing diameter; 
 the milling drum includes milling tools having a cutting diameter; and 
 a ratio of the planetary reduction gear housing diameter to the cutting diameter is no greater than 0.45. 
 
     
     
       12. The automotive road milling machine of  claim 11 , wherein:
 the ratio of the planetary reduction gear housing diameter to the cutting diameter is in a range of from about 0.38 to about 0.42. 
 
     
     
       13. The automotive road milling machine of  claim 1 , wherein:
 the at least one milling tube element has a milling width more than one-half a maximum milling width of the drum housing; and 
 the machine further comprises a support ring assembly attached to the basic drum body, the at least one milling tube element being received on the support ring assembly. 
 
     
     
       14. The automotive road milling machine of  claim 1 , wherein:
 the milling drum drive includes a belt drive including a belt pulley, the belt drive projecting outward relative to the machine frame; and 
 the planetary reduction gear housing is located outside the drum housing between the belt pulley and the drive-side drum housing wall. 
 
     
     
       15. The automotive road milling machine of  claim 1 , wherein:
 the removable drum housing wall is located on a zero-clearance side of the machine; and 
 the milling drum is approximately flush with the machine frame on the zero-clearance side of the machine. 
 
     
     
       16. A road milling machine, comprising:
 a machine frame; 
 a drum housing attached to the machine frame, the drum housing including a drive-side drum housing wall and a removable drum housing wall; 
 a milling drum located between the drive-side drum housing wall and the removable drum housing wall, the milling drum including a drum body and a milling tube removably received on the drum body, so that the milling tube is removable by removing the removable drum housing wall and removing the milling tube from the drum body; 
 a planetary reduction gear including a planetary reduction gear outer housing attached to the machine frame so that the planetary reduction gear outer housing is fixed relative to the machine frame; and 
 a milling drum drive connected to the planetary reduction gear on a side of the planetary reduction gear opposite from the milling drum. 
 
     
     
       17. The road milling machine of  claim 16 , wherein:
 the planetary reduction gear outer housing is attached to the machine frame at at least two locations spaced along a length of the planetary reduction gear outer housing. 
 
     
     
       18. The road milling machine of  claim 16 , wherein:
 a first end of the drum body is supported from the machine frame by the planetary reduction gear; and 
 a second end of the drum body is supported from the machine frame by the removable drum housing wall. 
 
     
     
       19. The road milling machine of  claim 18 , wherein:
 the drum body extends through the drive-side drum housing wall; and 
 the machine further comprises a seal between the drum body and the drive-side drum housing wall for protecting the planetary reduction gear from debris within the drum housing. 
 
     
     
       20. The road milling machine of  claim 16 , wherein:
 the drive-side drum housing wall extends downward from the machine frame further than the planetary reduction gear, to prevent the planetary reduction gear from engaging a ground surface. 
 
     
     
       21. The road milling machine of  claim 16 , wherein:
 the milling tube is a one piece milling tube element. 
 
     
     
       22. The road milling machine of  claim 16 , wherein:
 the drum housing has a discharge opening defined in a longitudinal drum housing wall extending between the drive-side drum housing wall and the removable drum housing wall. 
 
     
     
       23. The road milling machine of  claim 16 , further comprising:
 a wear element connected to the machine frame and extending below the planetary reduction gear generally parallel to a ground surface for protecting the planetary reduction gear from engagement with the ground surface. 
 
     
     
       24. The road milling machine of  claim 16 , wherein:
 the planetary reduction gear has a planetary reduction gear outside diameter; 
 the milling drum has a cutting diameter; and 
 a ratio of the planetary reduction gear outside diameter to the cutting diameter is in a range of from 0.35 to 0.45. 
 
     
     
       25. The road milling machine of  claim 24 , wherein the ratio is in the range of from 0.38 to 0.42. 
     
     
       26. The road milling machine of  claim 16 , wherein:
 the milling drum includes a support ring mount attached to the drum body, and the milling tube is received over the support ring mount. 
 
     
     
       27. The road milling machine of  claim 16 , wherein:
 the removable drum housing wall is located on a zero-clearance side of the machine. 
 
     
     
       28. The road milling machine of  claim 16 , wherein:
 the planetary reduction gear is located outside the drum housing on an opposite side of the drive-side drum housing wall from the milling drum.